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Articles by Y.-J. LIU
Total Records ( 2 ) for Y.-J. LIU
  Y.-H. HU , Y.-J. LIU , L.-X. TIAN , H.-J. YANG , G.-Y. LIANG and W. GAO
  A growth experiment was conducted to determine the optimal carbohydrate-to-lipid (CHO: L) ratio for juvenile yellowfin seabream cultured in 340-L indoor recirculating tanks. Seven isonitrogenous (450 g kg−1 dietary protein) and isoenergetic (14.1 MJ kg−1) diets with increasing CHO: L ratios (0.03–5.09 g: g) were fed to triplicate groups of 30 fish with an initial weight of 4.91 g for 56 days. Fish were fed to satiation twice a day and the water temperature ranged between 28 and 31.7 °C during the experimental period. Survival was high in all the groups and was not affected by dietary treatments. Best weight gain (WG) and specific growth rate (SGR) were observed in fish fed diets with CHO: L ratios of 0.29 and 0.72, which were not significantly different from that of 0.03, 1.26 and 1.92, but apparently higher than that of 3.22 and 5.09. Feed efficiency (FE), protein efficiency ratio (PER) and protein production value (PPV) followed the same general pattern as WG and SGR. Highest level of energy production value (EPV) was found in fish fed diets with CHO: L ratio of 0.72. Proximate compositions of fish whole body and tissues were markedly affected by dietary CHO: L ratios. Whole body, muscle and liver lipid increased as CHO: L ratios decreased, whereas moisture contents were reduced. Dietary CHO: L ratios had no significant effect on protein content in whole body and muscle. Plasma total cholesterol levels of fish fed diets with CHO: L ratios less than 0.72 were significantly higher than those of the other groups. Triacylglyceride levels decreased linearly as dietary CHO: L ratios increased. Viscerosomatic index (VSI) significantly increased as dietary CHO: L ratios decreased. Intraperitoneal fat ratio (IPF) of fish fed diets with CHO: L ratios less than 1.92 were significantly higher than those fed CHO: L ratios of 3.22 and 5.09. Hepatosomatic index (HSI) did not vary between the test diets. Based on second-order polynomial regression analysis of WG against dietary carbohydrate and lipid levels, 84.1 g kg−1 of carbohydrate and 136.3 g kg−1 of lipid, corresponding to a CHO: L ratio of 0.62, in a diet holding 450 g kg−1 of crude protein and 14 KJ g−1 of metabolizable energy, proved to be optimal for juvenile yellowfin seabream.
  C.-X. YE , L.-X. TIAN , H.-J. YANG , J.-J. LIANG , J. NIU and Y.-J. LIU
  This study was conducted to investigate the effect of dietary manganese (Mn) on growth, vertebrae and whole-body Mn content of juvenile grouper, and to examine the effect of dietary Mn on copper (Cu), iron (Fe), zinc (Zn), calcium (Ca), phosphorus (P) and magnesium (Mg) content of vertebrae and whole body. Seven casein-gelatin-based diets were supplemented with 0, 5, 10, 15, 20, 50 and 1000mgkg-1 of Mn from MnSO4·H2O. Grouper with an initial weight of 12.9±0.4g were fed to satiation with one of the seven diets for 8weeks. Growth was not significantly affected by dietary Mn supplements. Vertebrae Mn increased from 31.7 to 118.1mgkg-1 dry weight with dietary Mn supplement increasing from 0 to 50mgkg-1 (y= -0.0002x3+ 0.0162x2+1.3903x+ 26.27, R2= 0.9561, where y is the vertebrae Mn content and x is the dietary Mn content). Whole-body Mn increased from 2.5 to 7.8mgkg-1 wet weight with dietary Mn supplement increasing from 0 to 50mgkg-1 (y=0.00001x3- 0.00107x2+0.11054x+ 2.24615, R2=0.9080, where y is the whole-body Mn content and x is the dietary Mn content). Dietary Mn had no significant effect on vertebrae Fe, Ca, P and Mg content, and whole-body Cu, Zn and Mg content. However, vertebrae Zn and whole body Ca, P were highest in fish fed diet supplemented with 15mgkg-1 of Mn. Based on this, Mn supplement of 15mgkg-1 might be the optimum when the basal diet contained 4mgkg-1 of Mn. Fish fed diet supplemented with 1000mgkg-1 of Mn did not show any gross abnormality or change in feeding behaviour, but Mn contents of vertebrae and whole body were as high as 695.1mgkg-1 dry weight and 42.5mgkg-1 wet weight, respectively. Also, whole body Fe decreased significantly when Mn supplement was up to 1000mgkg-1.
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